Financial indicators are quantitative measures that provide insight into the financial performance and health of a company, organization, or economy.Analyzing financial reports is crucial because certain indicators can be derived from the data within them.Oil is a crucial resource that serves as a primary source of energy for various industries and transportation. The global economy heavily depends on oil, and its availability and price have a significant impact on economic growth and stability.This paper will use methods such as comparative analysis, trend analysis, ratio analysis, and DuPont analysis to conduct a comprehensive analysis of China Petroleum's financial reports from 2019 to 2021 and draw conclusions.